效率、噪声和运行寿命是射流泵的三个主要性能指标．本文依据大量原、模型试验结果，尤其通过对泵内水流流态的观察，分析了影响射流泵上述性能指标的若干因素和主要原因．认为：影响效率的主要因素是面积比，噪声主要来自于泵的尸重汽蚀，预防汽蚀、提高易损部件材质，可有效地延长泵的运行寿命．在为大寨、漫湾等电厂的供排水射流泵设计中采取相应措施，收到了较为良好的效果．为提高泵的性能指标、设计性能优良的射流泵探索了一条可供借鉴的途径． Efficiency, noise and operating life are three major performance indicators of the jet pump. In this paper, based on a large number of original and model test results, especially through the observation of the flow pattern in the pump, several factors that affect the above performance index of the jet pump and the main reasons are analyzed. It is considered that the main factor affecting the efficiency is the area ratio, the noise mainly comes from the deadweight cavitation of the pump, the prevention of cavitation and the improvement of the material of the wearing parts, which can effectively prolong the running life of the pump. In the Dazhai, Manwan and other power plant water supply and drainage jet pump to take appropriate measures designed to receive a more good effect. In order to improve the performance index of the pump, the jet pump with excellent performance has been explored for a reference.